997819668 has 24 divisors (see below), whose sum is σ = 2586940160. Its totient is φ = 332606520.

The previous prime is 997819651. The next prime is 997819679. The reversal of 997819668 is 866918799.

997819668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4619428 + ... + 4619643.

Almost surely, 2^997819668 is an apocalyptic number.

It is an amenable number.

997819668 is an abundant number, since it is smaller than the sum of its proper divisors (1589120492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997819668 is a wasteful number, since it uses less digits than its factorization.

997819668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9239084 (or 9239076 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 997819668 is about 31588.2837140608. The cubic root of 997819668 is about 999.2726938206.

It can be divided in two parts, 9978 and 19668, that added together give a triangular number (29646 = T₂₄₃).

The spelling of 997819668 in words is "nine hundred ninety-seven million, eight hundred nineteen thousand, six hundred sixty-eight".